Power reverse gear



March 8, 1938. c. c. FARMR POWER REVERSE GEAR YFiled Feb. 19, 1956 liilllllllllinimm` MN NQ com N. n. o@ Q 4%/ ATToRN Patented Maas, 193s Y f, f a. 2,110,702 "e,

'UNITED fsw-Es; f

. 2,110,702 Powuannvpasu oma l Clyde'C. Farmer, Pitts urgh, Pa.,y asslgnor toilrller v Westinghouse Airy rake Company, Wilmer-.f1 ding, Pa., 'acci-poration of APennsylvania Appueaubn February 19, '1936, sena; No. 64,9311 'Y f l2z Claim. (ci. 1371s9)/ A This invention relates to power reverse geari'or in the cab ci the locomotive. The reversing lever steam locomotives and morev yparticularly to 4' is fulcrumed at'itslowerend' and is adapted i means for controlling the operation thereof. to be manually moved yin either direction from Certain apparatus on a locomotive, such kas A the neutralposition shown, relative toaquadrant n ,5 the power reverse gear, is adapted to be oper- 5. `According to thedirection of movement ofthe '5 ated by fluid under pressure preferably in the lever l Ion the quadrant '5, the power reverse form of compressed' air takenA from the main gear .I is operated' byfiluid'under pressure supreservoir of the'usual fluid pressure brake system, plied through pipe VLtofeifect operation of mech'- butin case of failure'of thesupply of compressed anism on the locomotive@whichy determines the '10 air,the power reverse gear is adapted toibe direction in which thelocomotive will travel when 10` operated by steam taken from the steam turret motive power is applied. As so'far described this on the locomotive boiler. y j apparatus and its operation are .well known and 1 Suitable valves are provided for controlling since the invention does not reside inthe particu# the supply of compressed air and steam for/,opere lar construction and operation Voi.' auch,l a` morek 1,5 atingr the reverse gear, these valves being ar"k detailed description thereof isnot deemed neces- 15 ranged so that fluidv under pressure from one saryto a comprehensive understandinglof the source may be cut oif when fluid under pressure invention. Jz, v .n .s y s s v from the other sourcefis being employed. y According kto one form of theinvention, Va valve In the systems heretofore employed howeven,4 device I'is provided for controllin'gthesupplyof when compressed air is being used for controlling uid under pressure to the pipe: leading tothe 2Q the reverse gear, thereis a possibility that, duefor` 'reverse gear I.` f N l K i "1- instance to a leaking valve or thelike, steam pres- AThe vvalvev devices comprises afca'sing containsure in the steam connection 'to the reverse gear ing two spaced. connected pistons 'I and B and may" force steam or ,-water from this connection a vslide valve 9 adapted tobe operated by'said to the reverse gear and possibly through the com'- pis/tons, said slide valve lbeing disposed in a cham? 25 `pressed air pipes to the mainjreservolr. ber I0 formed' between the pistons. f' Precautions are taken te reduce the moisture Achamber' II`-is formed" at thelltel face" 0f content ofthe compressed air inthe main reserpiston 1 and-is adaptedtoube connected through a voirs to a. minimum in order to avoid dimculties, port I2in aplugvalve I3 toa vpipe I 4 whichleads resulting from water or'ice, in air brake appatoa pipe I5 lconne'ctedto`theu`sual main reser` 30 l ratus, power reverse gears, and the like which use Voir( I6 which is'adaptedftobesupplied withrfiuid the compressed air. v underpressure in 'the forni of compressed air iny It willtherefore be evident that it is desirable the usual well known manner. A `handle Il iS to prevent steam or water entering the main resprovided for turning the :plug'valve I3 from the ervolr and passing therefrom to the apparatusv open position shown iFig. 2fto a closed position 35 controlled by compressed air, and the principal in which the handlelg'l will occupy'the position g .l object of the invention is to provide improved indicated by the referencecharacter I8 vand the f means for controlling the supply of compressed port`I2 will be at rightl angles-*to the position air and steam for operating the power reverse shown in the drawing. A spring 3l)v is provided 40 gear or theA like on the locomotive, such that in Chamber Il and aCtS'bn the 91515011 1 urging 40 steam orv water cannot be forced into the main said piston and the pistox'rv landslide valve 9 in reservoir or conduits communicating therewith. a direction toward theright hand. i p

In the accompanying drawing; Fig. 1 is a, phan-` f y, A chamber I9 is'formed at the youter face of they U tom, side elevational view of a portion of a locopiston 8 and isadaptedt'obe connected throughs. motive showing a power reverse gear and control port 20 lin a plug valve `2l toV a?, pipe 22which is 45 means, embodying one form of the invention, adapted to be supplied with steam from the locosuperimposed thereon; Fig. 2 is a sectional view motive boiler throughthe usual steam turret 23. i of a control valve device shown in Fig. 1; and The plug valve 2Ihasa closed position as shown Fig. 3 is a diagrammatic view, mainly in section, n in the drawing and an Open 9051171011111 which of a modified form of the invention. the port 20 `establishes vcommunication from 50 As shown in Fig. 1 of therdrawing, a power re- ,chamber I9 to pipe 22.y A `handle 24 is provided verse gear I, of any desired construction, is sefor'turnng Said ValVtO itsfdielenffpositins. cured to the side of the locomotive andis con- It is preferredy to' control the'operation of the h nected to a fluid pressure supply pipe 2, and is power reverse gear I by compressed air drawnV 1 .55 also connected by a rod3 to a reversing lever 4 `from the main reservoir Itand in orderto doso,l

the plug valve 2| is normally maintained in the closed position so as to cut of! the supply oi steam from the steam pipe 22 to chamber I9. The plug valve I3 is normally in the open position, as shown in the drawing, in which compressed air from main reservoir i6 is` supplied through pipe I4 and port I2 in plug valve I3 to piston chamber I I.

With the pistons 1 and 8 in the`position shown in the drawing the chamber I9 is vented to the atmosphere through passage 25, cavity 26 in slide valve 9 and an atmospheric passage -21. This permits the pressure of compressed air in chamber II acting on piston 1 to hold the pistons 1 and 8 and slide valve 9 in theposition shown in the drawing in which the piston 8 is pressed into sealing engagement with a gasket 28 so as to prevent leakage past the piston 8.

With the pistons 1 and 8 and slide valve 9 conditioned as just described, communication is established from the mainreservoir I6 to the power reverse gear Ithrough pipe I4, port I2 in plug valve I3, piston chamber |I, passage 29 and pipe 2, so that compressed air from the main reservoir I6 may be used for operation of said power reverse gear. Compressed ai;` supplied to passage 2 9 also'fiows to valve chamber II) and acts on the slide valve 9 .to hold said valve seated.

With the device 8 in the operating position just described, it will be. noted that ii the plug valve 2| leaks so that water or'steam may leak or be forced from the steaml pipe 22 past said plug valve, such wateror steam is vented to the atmosphere through psage 25, cavity 26 in slide valve 9 and the atmospheric passage 21, and since the piston 8 is sealed againstgasket 28 and the slide valve 9 is pressed against its seat, waterror steam which. may bein chamber I9, passage 25 f 'orl cavity 26 cannot gain access to the chambers 'or passages containing compressed air and therefore cannot enter the main reservoir I6.

Ii.' for any reason, such as failure of the supply of compressedy air, itis desired to'use steam foroperating the power reverse gear I, the plug valve I3 isclosed and the plug valve 2| opened. Steam then iiows from pipe 22 to piston chamber I9 and acts onA the piston 8 which moves said piston and lthereby the piston 1 and slide valve 9 from the position shown in the drawing to a positiondened by engagement of the piston 1 with a gasket 3|. Incase it is desired to use steam for the power reverse `gear at a time when` there might be compressed air in chamber Il,

the above described shifting of parts is ensured, since the steam pressure employed on the locomotive and supplied to chamber I9 suil'iciently exceeds the air pressure carried in the main reservoir I6 and which might be acting in chamber II at the time the plug valve 2i was opened.

As the pistons 1 and 8 move to their left hand position, said pistons move vover the passage 29 so that the right hand end of the passage is connected to` chamber I9 and the left hand end is opened to valve chamber I9. Steam then iiows from chamber I9 to passage 29 and from thence to pipe 2 leading to the power reverse gear I so that said gear may be operated by steam. Steam also iiows from passage 29 tov valve chamber I9 and acts to seat the slide valve 9.

The movement of 'the pistons 1 and8 to the left hand position shifts the slide valve 9 to a position in which cavity 26 therein connects passage 32 to the atmospheric passage 21 and since passage 32 is connected tothe piston chamber II, said chamber is consequently vented.

With the parts of the device in this left hand or reverse position the piston 1 seals against gasket 3| so that there can be no leakage of steam or water past said piston to chamber Il, and since the slide valve 8 prevents leakage of steam or water from chamber I0 or passage 25 to passage 32, steam or water can not leak or otherwise gain access to the air pipe I4 and thus the'main reservoir I6.

When itis desired to cut oif the supply of steam to pipe 2 and again supply compressed air to said pipe for use in operation of the power reverse gear, the plug valve 2| is turned to its closed position, and the plug valve I3 is turned to its open position, as shown in the drawing. When the supply of steam is thus cut oi from chambers I9 and I9, the steam contained therein promptly condenses, thus reducing the pressure in said chambers sufficiently for the pressure oi the compressed air in chamber II acting on piston 1 to move the piston 1 away from the gasket 3| following which said piston and the piston 8 and slide valve 9 are promptly shifted back to the position shown in the drawing in which compressed air is supplied to pipe 2 and the steam chamberv|9 is vented to the atmosphere through cavity 26 in slide valve 9 and the atmospheric passage 21.

'I'he spring 30 acting .on the, piston 1 aids the pressure of air in chamber II to move the pistons 1 and 8 and slide valve 9 to the position shown in the drawingwhen the supply of steam is cut oil to chamber I9 and the supply of compressed air is opened to chamber II. Although the spring is not essential to this reversing operation, it will be noted that more prompt reversal of the parts will be secured by its use since such reversal will occur upon a less reduction in pressure in chamber |9, due to condensation oi' steam,

than `would otherwise be necessary.

'I'he spring 39' also serves another useful purpose in that it positions the pistons 1 and 8- and slide valve 9 so that there will be no loss of compressed air through the atmospheric passage 21 in case the plug valve I3 is open when a locomotive is being preparedV for service and the main reservoir I6 isconsequently being charged with iluid under pressure. Without the spring 30 such loss of compressed air might occur since with a locomotive dead the pistons 1 and 9 and slide valve 9 would be free to shift and might occupy their left hand position at the time the main reservoir I6 was being initially charged and would therefore permit loss of compressed air untilsuilicient pressure was built up in chamber IIVto shift the'plstons and slide valve 9 to their right hand position so as to close communication from passage 32 to passage 21.

According to the modified form of the invention shown in Fig.v 3the pipe 2 through which iluid under pressure is supplied to the power reverse gear I is connected through a branch pipe 33 and a plug valve 34 to the compressed airv supply pipe Il and through another branch pipe 35 and a steam valve 36 to the steam supply in turret 23.

Theplug valve 3l has an open position as shown in the drawing in which communication is established through a port 31 from pipe I4 to pipe 33, and a closed position in which said communication is closed. A handle 38 is provided for turning the valve 3l to its different positions. y

The steam valve 36 comprises a casing secured to the steam turret 23 and having a chamber 39 which is open at one end. The open end oi chamber 39 is closed byacap nut 4|) secured to the casing preferably by screw-'threadedengagement. f i

The cap nut 40is provided onfits inner face with an axially arranged valve seat 4| surrounding a cavity 42 which is vented to the atmosphere through one or more small leakage ports 43. Inv the casing there is provided a valve seat 44 surrounding a cavity 45 which is open `the power reverse gear l.

through one or more ports v46 in a partition wall 41 to a chamber 48 which is in communication with the steam supply in turret 23. Y

The valve seats 4| and 44 are spaced apart and are coaxial. A movable element is disposed in chamber 39 vand is provided on one end with a valve 49 adapted to engagethe seat 44 and on the other end With a valve 50 adapted to engage the seat 4|.

to the outer end of the spindle 52y for turning.

same and thereby moving the valve element 49, 50 from engagement with seat 4I to engagement with seat 44 and reverse.

In operation, when it is desired to employ coinpressed air for operating the. power reverse gear I, theplug valve 34 is turned to its open position as shown in the drawing, while in the steam valve the hand wheel 53 is turned to move the valve element 49, 50 until the valve 49 is `in engagement with its seat 44 thereby preventing steam supplied chamber 45 from the steam turret 23 from entering the chamber' 39.

When the parts are adjusted as just described, compressed air ilows from the supply pipe AI4 through port 31 in the plug valve 34 to pipe 33 and thence through a check valve 54 and pipe 2 -to the power reverse gear YI. A check valve 55 is provided in branch pipe 35 which prevents compressed air supplied to pipeY 2 from iiowing through pipe 35 to chamber 39 in the steam or Water from the steam supply pipe 22 past the valve 49 into chamber-39 such lealtage will be dissipated through the atmospheric ports `43 and thus cannot be forced into or otherwise gain access to the compressed air pipes 33 and i4 and thus enter the main reservoir i6.

If instead of compressed air it is desired to` use steam for operating the power reverse gear I, the plug valve 34 is turned to its closed posirtion and the hand wheel 53 is operated to'turn the spindle 52 and pull the valve element 49, 50 away from the seat 49 and into engagement with the seat 4|. `This operation of the steam valve admits steam from the steam turret 23 to chamber 39 and closes communication from said chamber to the atmospheric ports 43.

Steam thus supplied` to chamber 39` flows through pipe 35, check valve 55 and pipe 2 to The check valve 54 prevents the flow of steam or water to the conipressed air pipes 33 and I4 and from thence to the main reservoir i5 in case the plug valve 34 is open at the time the steam. valve 36 is operated to supply steam to pipe i.

It will now be noted that in both forms of the invention steam or water cannot be forced into:l

or otherwise obtain entry into the-main reservoir I3` or other` parts of thev compressed air system on Vthe locomotive.

while two illustrative embodiments ofthe inerative to -control the supply of uid under pressure from onesource to said device, a second valve means operative to control the supply of fluid under pressure from another source to said device,`means for preventing ilow' of iiuid under pressure yfrom one valveymeans to the other,

` and means included in the preventing means for venting the communication `between said second valve means and the preventing means when said second valve means is in the position for cutting off the supply of fluid under pressure to said device.

2. In combination, a device adapted to be opi erated by fluid Aunder pressure, a first valve means operative to control the supply of uid under pressure from one source to said device, a second valve means operative to control the supply of fluid lunder pressure from another source to said device, and means for preventing the ilow of fluid under pressure from said first valve means to said second valve means and operative to vent the communicationleading to said second valve means. y

3. In combination, a device adapted to be operated by fluid under pressure, a first valve means operative to control the supply of iluid under pressure from one source nto said device, a second valve means operative to control the supply of fluid under pressure from another source to said device, means movable to a position for preventing flow of fluid under pressure from said iirst valve means to said second valve means and operative in said position to vent the communication between said second valve means and the preventing means when said second valve means is in the position for cutting oil the supply of iiuid under pressure to said device and said first valve means" is in the position for supplying fluid under pressure to said device.A

p 4. In combination, a device adapted to `be operated by Huid under pressure, valve means operative to control the supply of fluid under pres'- 10 bythe terms of the Itis sure from one source to said device, other valve means operative to control the supply of fluid under pressure from another source to saiddevice, means for preventing ilow of iluid under pressure `il'rom one' valve means to the other, one of said valve means being operative in the position for cutting oil? the supply of duid under pressure to said device to vent the communication leading to the preventing means.

5. In combination, a d'evice adapted to be operated by huid under `pressure supplied from either one source or another source. and valve means for controlling such supply, said` valve means comprising a valve operative to either of fluid under pressure from one source to said device,.another valve operativeA to either'supply Afluid under pressure or cut oil? the supply of fluid under pressure from the other source to said device, and means for preventing fluid under pressure supplied by one valve from acting on the other valve, the preventing means'including means for venting the communication between one valve ,and the preventing means when such valve is in the position for cutting olI the supply of fluid under pressure to said device.

6. In combination, a device adapted to be operated by fluid under pressure supplied from either one source or another source, a valve operative to either supply fluid under pressure or cut off the supply of fluid under pressure from one source to said device, another valve operative to either supply fluid under pressure or cut off the supply of fluid under pressure from the other source to said valve device, means for preventing flow of fluid under pressure supplied by one valve to the other valve, one of said valves being operative in the position for cutting oiI the supply of uid under pressure to said device to vent the communication leading therefrom to the preventing means.

'7. In combination, a. device adapted to be'operated by fluid under pressure supplied from either one source or another source, a valve operative to either supply fluid under pressure or cutoff the supply of fluid under pressure from one source to said device, another valve operative to either supply fluid under pressure or out ofi' the ysupply of fluid under pressure from the other source to said valve device, means for` preventing Aflow of uid under pressure supplied by one valvel to the other, valve, and means operated by uld under pressure supplied by one valve when the other valve is in the position for cutting off the lsupply of fluid under pressure to said ,device for venting the communication leading to said other valve.

i 8. In combination, a device adapted to be operated by fluid under pressure supplied from either one source or another source, a valve operative to either supply fluid under pressure or cut off the supply of fluid under pressure from one source to said device, another valve operative to either supply f iuid under pressure or cut ou the supply of fluid under pressure from the other source to said valve device, means for preventing flow of fluid under pressure supplied by one valve to the other valve, and means operated by fluid under pressure supplied by one valve when `the other valve is in the position for cutting of! the supply of fluid under pressure to said device for establishing communication from said one valve to said device and for venting the communication leading to said other valve.

9. In combination, a device adapted to be operated by fluid under pressure supplied from either one source or another source, a valve operative to either supply fluid under pressure or cut oil the supply rof fluid under pressure from one source to said device, another valve operative to either supply fluid under pressure or cut oiI the supply of fluid under pressure from the .other source to said valve device, means for preventing flowfof fluid under pressure supplied by one valve to the other valve, and means operated by fluid under pressure supplied by one valve when the other valve is in the position for cutting of! the supply of fluid under pressure to said device for closing communication from said other the other source to said valve device, means for preventing flow of fluid under pressure supplied by one valve to the other valve, and a valve device for controlling communication from lboth of said valves to said device and having one position for closing communication from one of said valves to said device and for venting such communication and having another position for closing communication from the other of said valves to said device and for venting such communication.

11. In combinationf-a device adapted to be operated by fluid under pressure supplied from either one source or Yanother source, a, .valve operative to either supply fluid under pressure or cut off the supply of fluid under pressure from one source to said device, another valve operative to either supply iluid under pressure or cut off the supply of fluid under pressure from the other source to said valve device, means for preventing flow of fluid under pressure supplied lby one valve to the other valve, a valve device for controlling communication from both of said valves to said device and having one position for closing communication from one of said valves to said device and for venting such communication and having another position for closing communication from the other of said valves to said device and for venting such communication, and means actuated by vfluid under -pressure supplied by oneA of said valves when the other valve is in the position for cutting off the supply of fluid under pressure to said device for operating said valve device.

12. In combination, a device adapted to be operated by fluid under pressure supplied to a pipe, a manually operated valve for controlling the supply of fluid under pressure from one source to said pipe and having a position for cutting off such supply, another manually operated valve for controlling the supply of fluid under pressure from another source to said pipe and having a position for' cutting off such supply, a check valve in the communication between one of said manually operated valves and said pipe, another check valve in the communication between the other manuallyI operated valve and said pipe, one of said manually operated valves being operative in the cut-off position to vent the communication leading to the check valve therein.

13. In combination, a device adapted to be operated by fluid under pressure supplied to a pipe, a manually operated valve for controlling the supply of fluid under pressure from one source to said pipe and having a position for cutting olf such supply, another manually operated valve for controlling the supply of fluid under pressure from another source to said pipe and having a position for cutting off such supply and for venting the outlet communication connected thereto', a check valve in the communication between the rst mentioned manually operated valve and said` pipe, and another check valve in the communication between the second mentioned manually operated valve and said pipe.`

14. In combination, a device adapted to be operated by fluid under pressure supplied to a pipe, a manually operated valve for controlling the supply of iiuid under pressure from one source to said pipe and having a position for cutting oir` such supply, another manually operated valve for controlling the supply of riiuid under pressure from another source to said pipe and having a position for cutting off such supply, a valve having one position for establishing communication from one manually operated valve to said pipe and for venting the communication leading to the other manually operated valve and having another position for reversing said communication, and means operated by iiuid under pressure supplied by one or the other of said manually operated valves for positioning said valve.

15. In combination, a device adapted to be operated by iiuid under pressure supplied to a pipe, a main reservoir adapted to be charged with compressed air, and a source of steam pressure, a manually operated valve having one position for supplying compressed air from said main reservoir to said device and another position for cutting off such supply, a manually operated steam valve comprising a casing and a double ended valve mounted therein movable to one position for supplying steam from said source of steam pressure to said device and movable to another position for cutting off the supply of steam to said device and for venting the communication supplied With steam inthe rst mentioned position, and check valve means interposed in the communications between the manually operated valves and said pipe for preventing flow of fluid under pressure supplied by one manually operated valve to the other manually operated valve.

16. In combination, a controlling device adapted to be operated by iiuid under pressure, two sources of fluid under pressure, and a valvedevice movable to a position to connect one source of fluid under pressure to said controlling device and lto connect with the atmosphere a communication through which iiuid under pressure is supplied from the other source of fluid under pressure to said valve device.

17. In combination, va controlling device adapted to be operated by iluid under pressure, two sources of fluid under pressure, one of which is steam and the other compressed air, and a valve device movable to a position to connect one source of iiuid under pressure to said controlling device and to connect with the atmosphere a communication through which iiuid under pressure is supplied from the other source of fluid under pressure to said valve device.

i8. In combination, a controlling device adapted to be operated by fluid under pressure, two sources of uid under pressure, a valve device operated by iiuid under pressure supplied from one source to establish communication from said source to said controlling device and to connect to the atmosphere a communication through which fluid under pressure is supplied from the other source to said valve device, and manually operable valve means for controlling communication from one source to said valve device.

19. In combination, a controlling device adapted to be operated by fluid under pressure, two sources of iiuid under pressure, a valve device operated by fluid under pressure supplied from either one source or the other to establish communication from one source to said controlling device and to connect a communication leading to the other source with the atmosphere, and manually operable valve means for controlling communication 'from each source to said valve device.

20. `In combination, a device adapted to be normally operated by compressed air supplied through a communication to a pipe leading to said device and adapted upon failure of the supply of compressed air to be operated by steam pressure adapted to be supplied through a different communication to said pipe, meansffor preventing the ow of compressed air to the second mentioned communication and for preventing the flow of steam to the rst mentioned communication, and manually controlled valve means operative to cut oi the supply of steam to the second mentioned communication and to vent same.

21. In combination, a device adapted` to be normally operated by compressed air supplied through a communication to a pipe leading to said device and adapted upon failure of the supply of compressed air to be operated by steam pressure adapted to be supplied through a different communication to said pipe, means for preventing the ow of compressed air to the second mentioned communication and for preventing the iiovv of steam to the first mentioned communication, manually controlled valve means operative to cut oitthe supply of steam to the second mentioned communication, and means operative upon the operation ci said valve means to cut oi the supply of steam to the second mentioned communication to vent same.

.22. in combination, a device adapted to be normally operated by compressed air supplied through a communication to a pipe leading to said device and adapted upon failure of the sup'- ply of compressed air to be operated by steam pressure adapted to be supplied through a different communication to said pipe, means for preventing the iiow of compressed air'to the second mentioned communication and for preventing the iioW of steam to the rst mentioned communication, manually controlled valve means operative to cut oiT the supply of compressed air to the first mentioned communication, and other manually controlled valve means operative to cut oi the supply of steam to the second mentioned communication and to vent same.

CLYDE C. FARMER., 

